GitHub is a GOLDMINE for AI game developers.
I picked 10 powerful open-source repos that make building 3D games with Claude Code and Codex ridiculously easier.
Save these before your next project:
1. Gamedev Agent Skills
Give Claude Code and Codex reusable game-development skills for engines including Godot, Unity, Unreal, and Three.js.
github.com/gamedev-skills/aw…
2. MCP Unity
Connect your coding agent to Unity. Create scenes, modify objects, assign materials, run tests, and read console errors through prompts.
github.com/CoderGamester/mcp…
3. Godot MCP
Let your AI assistant create scenes, add nodes, run Godot projects, and inspect debug output while building your game.
github.com/Coding-Solo/godot…
4. TripoSR
Turn a single image into a 3D model. Useful for prototyping props and exploring assets before refining them for your game.
github.com/VAST-AI-Research/…
5. Drei
Ready-made helpers for React Three Fiber: camera controls, environments, skies, shadows, and model loading for browser-based 3D games.
github.com/pmndrs/drei
6. React Three Rapier
Add physics to React Three Fiber games, including rigid bodies, collision detection, and joints, without writing a physics engine yourself.
github.com/pmndrs/react-thre…
7. Yuka
Build NPC behavior with steering, pathfinding, perception, and state-driven decisions. Give your characters more to do than stand around.
github.com/Mugen87/yuka
8. Three.quarks
Build particle effects for Three.js games, from sparks and smoke to magical trails. Includes a visual editor for designing effects.
github.com/Alchemist0823/thr…
9. React Postprocessing
Give React Three Fiber scenes a visual upgrade with bloom, depth of field, noise, and vignette effects.
github.com/pmndrs/react-post…
10. Colyseus
Build multiplayer features with rooms, matchmaking, reconnections, and automatic game-state synchronization between your server and players.
github.com/colyseus/colyseus
Which one are you using in your next game?